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#11
03-11-2011, 08:58 AM
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There are other cam manufacturers and grinds. Do you want some help picking one? I'd like to help if you're interested.
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#12
03-11-2011, 09:01 AM
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YA, I would love your suggestion.
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#13
03-11-2011, 09:14 AM
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It would help to know what casting the heads are. The numbers are easy to see, they're right on the top side of the heads in between the rocker studs...usually a 7 or 8 digit number.
Later I will be able to spend some time on this.
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#14
03-11-2011, 04:33 PM
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#15
03-14-2011, 06:34 AM
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Thanks. I will try and get that casting number tonight.
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#16
03-22-2011, 06:28 PM
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Got Em!
Took me a bit but I was able to take a peek at those numbers. I found a seven digit number upside down on both heads that was the same in the location you described. The number is #3986339
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#17
03-22-2011, 07:56 PM
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.Those heads are smogger heads, designed for fuel economy, and emissions compliance. Just like the 307 itself, they aren't performance pieces by any stretch of the imagination. They have 74cc chambers, and give your 307 a very low compression ratio of roundabout 8:1. Make no mistake, the thing will run with those heads on it, but for a few bucks...say maybe $400 or so, you could be in much better shape with a different set of heads.
Your engine would have been very very very very lazy with that 292 cam in an 8:1 307.
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#18
03-23-2011, 06:47 AM
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Quote:
I just wanted to refresh what I had. And fuel economy is a consideration, since this will be a daily driver. My cam choice is mostly for some lumpy sound. Still think that link to the Summit cam is the way to go?
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#19
03-23-2011, 09:25 AM
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This is a tough one, man. You're going to have to make a compromise. That lumpy or lopey sound comes from a long duration, big overlap, and quick closing lobe ramps. Usually that means that an engine is built to start putting on heavy duty power well into the RPM band, say upwards of 3000 rpm....and typically equipped with a big stall and tall gears.
The intended use of your car is to daily drive. You don't want a big lopey cam for this. Well, let me ask instead of assume.... Which do you want... A 307 that is a dog...absolute DOG that "sounds" like it is mean but can't get out of its own way -or- A 307 that when you mash the pedal, the car actually responds ??? That sound you're looking for, usually means that the engine is over-cammed. That Howards cam I linked from summit is still a good choice. There are others though. I suggest a cam on a 110 LSA or 112 LSA, and advertised duration around 250 to 260. Here are a few to look at.... http://www.summitracing.com/parts/SUM-1101/ http://www.summitracing.com/parts/SUM-1100/ http://www.summitracing.com/parts/SUM-1787/ http://www.summitracing.com/parts/ISK-201256-262/ http://www.summitracing.com/parts/ISK-201256/ http://www.summitracing.com/parts/LUN-60100/
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#20
03-23-2011, 09:51 AM
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I see what your saying about idle. The first two cams listed seem right up my alley. They make power right from idle to 4800. The price is great as well. My goal is just to have a good running , reliable motor to hold me over untill I can put together a serious motor. If I ever make it to that point.
Of those two, which one would be better suited for my app? Thanks very much for your help.
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